My respect to that person who created this question.
Here is very nice questions, which shows how tricky may be GMAT questions. Professionals who create such questions are also phycometrists - (or smth like that). They are sycologists who know how the logical flow of an ordinary person works and what are the gaps.
Most of you have realised that in 1) In the first 2 hours the bus....
- they talk about a part of total time
in 2) The average speed of the bus for the first half of the distance was
- they talk about a part of total distance.
you want to solve it rapidly you have heard about half of
and your brain does not want to care about this anymore.
This question may pretend to become one of my favorite questions.
Follow me, if you find my explanations useful.
Audaces fortuna juvat!